JPS57150232A - Phase synchronizing loop - Google Patents

Phase synchronizing loop

Info

Publication number
JPS57150232A
JPS57150232A JP56036286A JP3628681A JPS57150232A JP S57150232 A JPS57150232 A JP S57150232A JP 56036286 A JP56036286 A JP 56036286A JP 3628681 A JP3628681 A JP 3628681A JP S57150232 A JPS57150232 A JP S57150232A
Authority
JP
Japan
Prior art keywords
frequency
frequency dividing
old
circuit
dividing ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56036286A
Other languages
Japanese (ja)
Inventor
Toru Akiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP56036286A priority Critical patent/JPS57150232A/en
Publication of JPS57150232A publication Critical patent/JPS57150232A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/101—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop

Abstract

PURPOSE:To shorten a lockup time of a PLL, by providing a gate circuit for reading away an input waveform. CONSTITUTION:When reference frequency f'r is set to f'r=M.fr (fr: old reference frequency, M: natural number), and a frequency dividing ratio of a programmable frequency dividing circuit is set to N/M, the same oscillation frequency as old frequency can be obtained, and also the frequency dividing ratio becomes 1/M as compared with its old ratio, therefore, natural angle frequency of a PLL and lockup time are shortened to M<1/2> times and 1/M<1/2>, respectively. In this state, however, the frequency dividing ratio N/M of the programmable frequency dividing circuit does not always become an integer and the frequency cannot be divided, therefore, a gate circuit 17 is provided, an output of a voltage control oscillator 13 is read away, and the remaining waveform output is divided by the programmable frequency dividing circuit 14. In this way, its apparent frequency dividing ratio becomes N/M, and the lockup time is shortened to 1/M<1/2>.
JP56036286A 1981-03-12 1981-03-12 Phase synchronizing loop Pending JPS57150232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56036286A JPS57150232A (en) 1981-03-12 1981-03-12 Phase synchronizing loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56036286A JPS57150232A (en) 1981-03-12 1981-03-12 Phase synchronizing loop

Publications (1)

Publication Number Publication Date
JPS57150232A true JPS57150232A (en) 1982-09-17

Family

ID=12465540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56036286A Pending JPS57150232A (en) 1981-03-12 1981-03-12 Phase synchronizing loop

Country Status (1)

Country Link
JP (1) JPS57150232A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124839U (en) * 1974-08-14 1976-02-24
JPS55664A (en) * 1978-06-19 1980-01-07 Toshiba Corp Frequency synthesizer
JPS5621422A (en) * 1979-07-30 1981-02-27 Int Standard Electric Corp Phase locked loop type frequency synthesizer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124839U (en) * 1974-08-14 1976-02-24
JPS55664A (en) * 1978-06-19 1980-01-07 Toshiba Corp Frequency synthesizer
JPS5621422A (en) * 1979-07-30 1981-02-27 Int Standard Electric Corp Phase locked loop type frequency synthesizer

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